On the Record · Biogen
Biogen subsidiaries, as it lists them
The subsidiaries Biogen lists in its latest annual report, with the jurisdiction of each, linked to the filing.
Subsidiaries it lists
| Subsidiary | Jurisdiction |
|---|---|
| Biogen Foundation Inc. | Massachusetts |
| Biogen MA Inc. | Massachusetts |
| Biogen Realty Corporation | Massachusetts |
| Biogen Realty Limited Partnership | Massachusetts |
| Biogen U.S. Corporation | Massachusetts |
| Biogen U.S. Limited Partnership | Massachusetts |
| Alcyone Therapeutics, Inc. | Delaware |
| Biogen (RTP) Realty LLC | Delaware |
| Biogen Chesapeake LLC | Delaware |
| Biogen Digital Health Inc. | Delaware |
| Biogen Digital Health Global LLC | Delaware |
| Biogen Holding I LLC | Delaware |
| Biogen Holding II LLC | Delaware |
| Biogen OUS Holding Inc. | Delaware |
| Biogen Manufacturing Holding LLC | Delaware |
| Biogen New Ventures Inc. | Delaware |
| Biogen SRO Inc. | Delaware |
| Biogen Therapeutics Inc. | Delaware |
| Biogen U.S. Pacific LLC | Delaware |
| Biogen U.S. West Corporation | Delaware |
| Conforma Therapeutics Corporation | Delaware |
| Human Immunology Biosciences, Inc. | Delaware |
| Stromedix, LLC | Delaware |
| Nightstar, Inc. | Delaware |
| Reata Pharmaceuticals Global, Inc. | Delaware |
| Reata Pharmaceuticals Holdings, LLC. | Delaware |
| Reata Pharmaceuticals, Inc. | Delaware |
| Biogen (Argentina) SRL | Argentina |
| Biogen Australia PTY Ltd | Australia |
| Biogen Austria GmbH | Austria |
| Biogen Belgium N.V./S.A. | Belgium |
| Biogen International Holding Limited | Bermuda |
| Biogen (Bermuda) Technologies Ltd. | Bermuda |
| Biogen Brasil Produtos Farmaceuticos LTDA | Brazil |
| Biogen Canada Inc. | Canada |
| Biogen Chile SpA | Chile |
| Biogen Biotechnology (Shanghai) Co., Ltd | China |
| BIIB Colombia S.A.S. | Colombia |
| Biogen Pharma d.o.o. | Croatia |
| Biogen (Czech Republic) s.r.o. | Czech Republic |
| Biogen (Denmark) A/S | Denmark |
| Biogen Estonia OU | Estonia |
| Biogen Finland OY | Finland |
| Biogen France S.A.S. | France |
| Biogen GmbH | Germany |
| Reata Germany GmbH | Germany |
| Biogen Hong Kong Limited | Hong Kong |
| Biogen Hungary KFT | Hungary |
| Biogen Idec Biotech India Pvt. Ltd. | India |
| Biogen Capability Center India Private Limited | India |
| Biogen Idec (Ireland) Ltd. | Ireland |
| Nightstar Europa Limited | Ireland |
| Biogen Distribution Services Limited | Ireland |
| Biogen Italia S.R.L. | Italy |
| Biogen Japan Ltd. | Japan |
| Biogen Korea LLC | Korea |
| Biogen Latvia SIA | Latvia |
| Biogen Lithuania UAB | Lithuania |
| Biogen Luxembourg Holding S.a.r.l. | Luxembourg |
| Biogen Mexico S. de R.L. de C.V. | Mexico |
| Biogen NZ Biopharma Ltd. | New Zealand |
| Biogen Norway AS | Norway |
| Biogen Poland Sp. z.o.o. | Poland |
| Biogen Portugal Sociedade Farmaceutica, Unipessoal Lda. | Portugal |
| Biogen Arabia Limited | Saudi Arabia |
| Biogen Regional Headquarters LLC | Saudi Arabia |
| Biogen Slovakia s.r.o. | Slovak Republic |
| Biogen Pharma, farmacevtska in biotehnoloska druzba, d.o.o. | Slovenia |
| Biogen Spain, S.L. | Spain |
| Biogen Sweden AB | Sweden |
| Biogen Digital Health International GmbH | Switzerland |
| Biogen International GmbH | Switzerland |
| Biogen International Neuroscience GmbH | Switzerland |
| Biogen Management Services GmbH | Switzerland |
| Biogen Switzerland AG | Switzerland |
| Eidetica Biopharma GmbH | Switzerland |
| Biogen Taiwan Limited | Taiwan |
| Biogen Turkey Ilac Ticaret Limited Sirketi | Turkey |
| Biogen B.V. | The Netherlands |
| Biogen Netherlands B.V. | The Netherlands |
| Biogen Idec Limited | United Kingdom |
| Biogen Idec Research Ltd. | United Kingdom |
| Convergence Pharmaceuticals Limited | United Kingdom |
| Convergence Pharmaceuticals Holdings Ltd. | United Kingdom |
| Old Convergence Pharmaceuticals Limited | United Kingdom |
| Reata U.K. Limited | United Kingdom |
| Silver Acquisition Co. Ltd. | United Kingdom |
| Nightstar Therapeutics Limited | United Kingdom |
| NightstaRx Limited | United Kingdom |
| Tungsten Bidco Limited | United Kingdom |
| Biogen Idec Uruguay SA | Uruguay |
From Exhibit 21 of the 10-K for 2025. Companies must list their significant subsidiaries there and may leave out smaller ones, so this is the company’s own list, not every entity it owns.
Read from Biogen’s annual reports (10-K for 2025, 10-K for 2024, 10-K for 2023) and the financial data it files with the SEC, as of 2026-02-06. Every quotation is word for word from the filing linked beside it; how these pages are built and checked. The full record is in its company data sheet.